[android][docs] add note how to install needed deps for android ndk on ubuntu 14.04 x86_64
[settings] - add new expert setting for enabling ios8 compatibility
[airplay] - implement different announcements when using the ios8 compatibility mode
[airplay] - implemented photo asset cache
[airplay] - send an error code for the fp-setup request
[airplay] - add some handy helpers for using binary plists
[airplay] - handle /play of newer airplay protocols - instead of location it sends 2 seperate entries host + path
[airplay] - merge the binary plist and xml plist pathes in airplay (which already diverged) by using libplist for parsing in both cases - not only the binary case
[airplay] - support the /play command which wants us to start playback "paused" - (camera roll on ios8 for example)
[ExternalPlayer] - reset m_time on openfile (fixes bad playcount marking
on successive played movies)
Dialog: Don't reset symbol keys after onClickButton

* Resetting the keys makes typing a URL, SMB, FTP or any address
    a longer process than is necessary, especially with a remote.

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>
[vobsub] Fix for incorrect colours with vobsubs and GLES

Fixes #15146

The code provides the overlay texture in BGRA format, which it informs GL about.
However GLES does not support BGRA, and just claims it is RGBA which results in a red/blue swap.

So this code path needs a red/blue swap.
CGUIEditControl: fix special key handling in edit controls after 7602c4cc88491b0bbde2b6798eb3bbe7528febea
CGUIDialogKeyboardGeneric: fix Home and End special key handling in the OSK
Don't get the progress handle if we don't have the progress dialog when scanning music
Hide dialogs for library clean/scan by default if automatically triggered.

This doesn't show dialogs and progress bars for library clean or scan if
initiated by an add-on or by a JSON-RPC client by default, as they're assumed
to be automatically triggered.

*library.backgroundupdate is still supported to let the user choose to not show
the progress even if user-initiated as it may take a while.
json-rpc: Add "showdialogs" to Audio/VideoLibrary.Clean/Scan. Bump to 6.19.0.
CGUIDialogKeyboardGeneric: fix generic GUI_MSG_SET_TEXT/GUI_MSG_INPUT_TEXT/GUI_MSG_INPUT_TEXT_EDIT message handling (fixes #15392)
[keyboardlayouts] add Norwegian
[keyboardlayouts] add Danish